I recommend that the best and most effective way to correct these waterspots and the damage they have created is by using a rotary polisher. Use a foam polishing pad polish with a light cleaner/polish, and pass over the waterspots to remove. After the spotting has been removed, then follow up with the PC and a premium polish to remove any halograming or swirl marks from the rotary polisher. And finally using the PC and a finishing pad, apply your wax or sealant, remove product with a MF and your done. The last touch would be a 360 around the vehicle with a QD for any dust or residue removel, and that last inspection......